Commit39b8cc9

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Be sure to release LogicalRepLauncherLock in DROP SUBSCRIPTION command.

Previously DROP SUBSCRIPTION command forgot to release the lock at all.Original patches by Kyotaro Horiguchi and Michael Paquier,but I didn't use them.Discussion:http://postgr.es/m/20170201.173623.66249355.horiguchi.kyotaro@lab.ntt.co.jp

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Original file line number	Diff line number	Diff line change
`@@ -514,6 +514,8 @@ DropSubscription(DropSubscriptionStmt *stmt)`
`514`	`514`	`/* Kill the apply worker so that the slot becomes accessible. */`
`515`	`515`	`logicalrep_worker_stop(subid);`
`516`	`516`
	`517`	`+LWLockRelease(LogicalRepLauncherLock);`
	`518`	`+`
`517`	`519`	`/* Remove the origin tracking if exists. */`
`518`	`520`	`snprintf(originname,sizeof(originname),"pg_%u",subid);`
`519`	`521`	`originid=replorigin_by_name(originname, true);`

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